CVE-2026-33610— Possible file descriptor exhaustion in forward-dnsupdate
Quick assessment
Affected
PowerDNS Authoritative
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
PowerDNS Authoritative是PowerDNS公司的一个DNS服务器软件。 PowerDNS Authoritative存在资源管理错误漏洞，该漏洞源于当PowerDNS辅助服务器将DNS更新请求转发给恶意主服务器时，可能导致文件描述符耗尽并最终拒绝服务。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-33610
Vulnerability Information
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Vulnerability Title
Possible file descriptor exhaustion in forward-dnsupdate
Source: CVE Program / CVE List V5
Vulnerability Description
A rogue primary server may cause file descriptor exhaustion and eventually a denial of service, when a PowerDNS secondary server forwards a DNS update request to it.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
PowerDNS Authoritative 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PowerDNS Authoritative是PowerDNS公司的一个DNS服务器软件。 PowerDNS Authoritative存在资源管理错误漏洞，该漏洞源于当PowerDNS辅助服务器将DNS更新请求转发给恶意主服务器时，可能导致文件描述符耗尽并最终拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| PowerDNS | Authoritative | 5.0.0 ~ 5.0.4 | - |
|
II. Public POCs for CVE-2026-33610
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · PowerDNS · 2026-04-22 · 22 CVEs total
| CVE-2026-33593 | 7.5 HIGH | Denial of service via crafted DNSCrypt query |
| CVE-2026-33608 | 7.4 HIGH | Incomplete domain name sanitization during |
| CVE-2026-33602 | 6.5 MEDIUM | Off-by-one access when processing crafted UDP responses |
| CVE-2026-33611 | 6.5 MEDIUM | Insufficient validation of HTTPS and SVCB records |
| CVE-2026-33261 | 5.9 MEDIUM | Null pointer accces in aggressive NSEC(3) cache |
| CVE-2026-33262 | 5.9 MEDIUM | Insufficient validation of cookie reply |
| CVE-2026-33260 | 5.3 MEDIUM | Insufficient input validation of internal webserver |
| CVE-2026-33609 | 5.3 MEDIUM | LDAP DN injection |
| CVE-2026-33254 | 5.3 MEDIUM | Resource exhaustion via DoQ/DoH3 connections |
| CVE-2026-33595 | 5.3 MEDIUM | DoQ/DoH3 excessive memory allocation |
| CVE-2026-33594 | 5.3 MEDIUM | Outgoing DoH excessive memory allocation |
| CVE-2026-33256 | 5.3 MEDIUM | Unbounded memory allocation by internal web server |
| CVE-2026-33257 | 5.3 MEDIUM | Insufficient input validation of internal webserver |
| CVE-2026-33258 | 5.3 MEDIUM | Crafted zones can cause increased resource usage |
| CVE-2026-33259 | 5.0 MEDIUM | Concurrent modification of RPZ data can lead to denial of servce |
| CVE-2026-33598 | 4.8 MEDIUM | Out-of-bounds read in cache inspection via Lua |
| CVE-2026-33601 | 4.4 MEDIUM | Insufficient validation of zonemd record |
| CVE-2026-33600 | 4.4 MEDIUM | Null pointer dereference in RPZ transfer |
| CVE-2026-33597 | 3.7 LOW | PRSD detection denial of service |
| CVE-2026-33596 | 3.1 LOW | TCP backend stream ID overflow |
Showing top 20 of 22 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Authoritative
-
CVE-2026-42005
Insufficient input validation of internal web server -
CVE-2026-41999
Incorrect Behaviour of Views with TCP PROXY Requests -
CVE-2026-42002
Concurrency and locking defects in GSS-TSIG -
CVE-2026-42001
Insufficient Validation of Autoprimary SOA Queries -
CVE-2026-42000
Insufficient Validation of Names During AXFR
Same vendor: PowerDNS
-
CVE-2026-52688
RRSIGs with too few labels can lead to bypass of DNSSEC wild -
CVE-2026-52686
Wildcard CNAME proof validation bypass -
CVE-2026-52684
Prefetch Feature Allows Persistent Ghost Domain Cache Poison -
CVE-2026-42389
Reject more queries with invalid header values -
CVE-2026-52690
Spoofed answers can mark an authoritative non-EDNS capable
V. Comments for CVE-2026-33610
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